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• W2339822182 endingPage "C817" @default.
• W2339822182 startingPage "C810" @default.
• W2339822182 abstract "We have used fluo 3-loaded mouse pancreatic acinar cells to investigate the relationship between Ca2+ mobilization and intracellular pH (pHi). The Ca2+-mobilizing agonist ACh (500 nM) induced a Ca2+ release in the luminal cell pole followed by spreading of the Ca2+ signal toward the basolateral side with a mean speed of 16.1 +/- 0.3 micron/s. In the presence of an acidic pHi, achieved by blockade of the Na+/H+ exchanger or by incubation of the cells in a Na+-free buffer, a slower spreading of ACh-evoked Ca2+ waves was observed (7.2 +/- 0.6 micron/s and 7.5 +/- 0.3 micron/s, respectively). The effects of cytosolic acidification on the propagation rate of ACh-evoked Ca2+ waves were largely reversible and were not dependent on the presence of extracellular Ca2+. A reduction in the spreading speed of Ca2+ waves could also be observed by inhibition of the vacuolar H+-ATPase with bafilomycin A1 (11.1 +/- 0.6 micron/s), which did not lead to cytosolic acidification. In contrast, inhibition of the endoplasmic reticulum Ca2+-ATPase by 2,5-di-tert-butylhydroquinone led to faster spreading of the ACh-evoked Ca2+ signals (25.6 +/- 1.8 micron/s), which was also reduced by cytosolic acidification or treatment of the cells with bafilomycin A1. Cytosolic alkalinization had no effect on the spreading speed of the Ca2+ signals. The data suggest that the propagation rate of ACh-induced Ca2+ waves is decreased by inhibition of Ca2+ release from intracellular stores due to cytosolic acidification or to Ca2+ pool alkalinization and/or to a decrease in the proton gradient directed from the inositol 1,4, 5-trisphosphate-sensitive Ca2+ pool to the cytosol." @default.
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• W2339822182 date "1998-09-01" @default.
• W2339822182 modified "2023-09-27" @default.
• W2339822182 title "Effect of intracellular pH on acetylcholine-induced Ca2+ waves in mouse pancreatic acinar cells" @default.
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• W2339822182 doi "https://doi.org/10.1152/ajpcell.1998.275.3.c810" @default.
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